Here We Go Again - But Bigger, Much Bigger....

No Photos yet as not really started.
Going for what i loving call a sheet cutter.

I'm still a Newb, but I seem to have found my skill set with making things workout in the end, lol.

So i'm about to build a Torsion Box bed for my CNC table top.
Just using MDF. I'm thinking if its good enough for wood workshop it should be tough enough for my table until i can upgrade.

Just for kicks i'm thinking about doing wooden construction for most of it.
MDF again

Using SBR's i'm thinking torsion boxes for gantry until i get brave enough to shell out for some juicy aluminum profile.

I'm sure i'm making life hard for myself but hey ho..

Your Harshest Comments are expected.

>I'm sure i'm making life hard for myself but hey ho..

While you're at it, use the stepper motors from your printer..! ;)

Heh, sorry - couldn't resist... In all seriousness, though - why?! Just go for it - make yerself one from extrusion that you'll keep for years..!

Wal.

No need for sorry Wal.
I've actually made a laser CNC with printer stepper motors, she didn't last long.
did however enable me to cut some pieces for an upgrade that i'm almost happy with.

As to the WHY!
Well I'm my own biggest pain in the arse, often aking things far more complicated than it has to be due to using junk laying about.
With a healthy splatter of cheapness sprinkled lovingly over the top.

I find a healthy amount of abuse for being sooo stupid does one of two things.
Correcting my thought patterns (temporarily) or pushing me to prove someone wrong (50/50 success rate).


So to summarize your appreciated post reply,
don't be a nob, just buy extrusion. (OK I can get behind that).

Shall I get SGR rather than SBR then mounting should be pie as a single line of centralised screw holes (me starting to think so).

I've no experience with the SGR gear. I used TBR supported rails on my mini-mill - they've served me well and continue to do so, but if I was building it again I'd use the HIWIN profile rails that I fitted to my larger scale router. A bit more expensive, but my advice would be you may as well get it right the first time..!

Sounds like you've already had adventures in CNC and I doubt that you're as 'stupid' as you make out. Stop messing, dive in!

Wal.

I'm looking at the table aluminium now!
Getting new quote for the rails n ball screws.
then i think i may well take a plunge.

So i've changed my mind and now aiming at just 4x4 foot cutting area for now.
Ordered my rails n bits

Attachment 24230
So they arrived eventually
all looked good!
only some uncleared out screw holes
Attachment 24231 (tap tap done)

Then after some dicking about i eventually purchased some sheet ali and made some plates.
Attachment 24232
No not out of the 3d printer but i did use it to make my guide.
Attachment 24233
what a fit!

so whats the 2 empty holes about??
Attachment 24234
attaching the ali profile!

Attachment 24235